-LRB- CNN -RRB- -- Eighteen victims of child pornography were rescued during a nationwide sweep by federal law enforcement agencies , U.S. Immigration and Customs Enforcement announced Friday .

The sweep , dubbed Operation Orion , resulted in the arrests of 190 individuals . Most of them were in the U.S. , but some were in Argentina , the Philippines , Spain and the United Kingdom , ICE said in a news release . The operation took place from May 1 to May 31 .

The arrests were made in 33 states and Puerto Rico , authorities said .

Some of the victims were residing in the homes of the persons arrested , ICE spokeswoman Danielle Bennett said .

For example , a child in San Diego was photographed in a shower , and authorities made a rescue in that home , Bennett said .

`` Let this operation be a warning to anyone who would think they can use the Internet to exploit children : we are out there looking for you , we will find you , and you will be prosecuted , '' ICE Director John Morton said in a statement .

Morton said that as children begin summer vacations , parents should pay extra attention to how much time they spend on the Internet .

`` Many of the child exploitation cases under Operation Orion began with a child or teen chatting with someone he or she met online , '' Morton said in the statement .

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NEW : Some of the child victims were residing in homes of adults arrested

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NEW : 190 people are arrested in United States and other countries

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NEW : Arrests are made in 33 states plus Puerto Rico

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NEW : A child in San Diego was photographed in a shower